A combined measurement method for the optical determination of the absolute rotational angle and torque was realized. Absolute codings of the angle as well as proper production technologies for the production of suitable markings on the shaft were investigated and successfully implemented.

The absolute rotational angle could be measured with a resolution of about 0.001° at an accuracy of better than 0.2° (corresponds to 0.05% f. s.). Torque was determined with an accuracy of about 3% f. s..

In this article, image processing of a binary single track code for determining torque is presented. The aim of the research is to determine the absolute angular position of a shaft and the applied torque. For capturing an image of the binary code two independent imaging modules are used, both allowing for measuring the angular position and rotational speed. Combining both imaging modules, torque can be determined. Position markings are directly applied on the shaft using a laser to ensure a simple integration of the system into any application. The selected technological approach is based on a contactless measurement method using angle differences. The concept of image processing as well as first research results are presented for determining the angular position twice and, thus, the torque applied to the shaft.

In this article, a combined contactless measurement method is presented which is based on angle differences. The aim is the development of a combined, optical measurement system to determine the angular position of a shaft and the applied torque on it as well as an appropriate production technology to apply markings. Two independent modules are used which separately allow the measurement of angular position and rotational speed and if combined can measure torque. To ensure a simple integration of the system into any application, position markings are directly applied on the shaft using a laser. The selected technological approach is based on a contactless measurement method using angle differences. The concept as well as first research results are presented.

The concept of angular difference allows simultaneous measurement of the relative and absolute rotation angle as well as the torque. The torsion of a shaft resulting from torque gets determined via the difference of two angles and converted into correlating torque. Today’s measuring devices use encoder disks or additional torque shafts. An incremental or absolute structure of measurement of the encoder disks is applied to it. Torque shafts are used frequently to extend the twist angle as a result of torsion. Current methods of measurement for rotation angle and torque are described.

The concept of angular difference allows simultaneous measurement of the relative and absolute rotation angle as well as the torque. The torsion of a shaft resulting from torque gets determined via the difference of two angles and converted into correlating torque. Today’s measuring devices use encoder disks or additional torque shafts. An incremental or absolute structure of measurement of the encoder disks is applied to it. Torque shafts are used frequently to extend the twist angle as a result of torsion. Current methods of measurement for rotation angle and torque are described.